Their biggest year was 1994 when they had all of their races on ESPN 2

They had a all of the top racers on their teams, but they only had to commit to a couple of races, so they could continue to ride with their trade teams.
The finals were held in Monte Carlo!
Then they lost all their money, the commissioner was an IDIOT, and they hardly did anything in 1995. It was a pretty cool idea, but poorly executed. And now the concept will never take off because of it.